Hi Again,
We have found that if the Ewes are eating Ok, not scouring, no limping, and dont look as is they are in discomfort that they are usually OK.
However, sheep being sheep, they can go from being OK to being dead in the blink of an eye, even, it seems, an odd shaped cloud in the distance seems to be able to kill a sheep if it's that way out!.
Keep a closer than usual eye on them as lambing approaches, if any are stood alone in a corner or not coming for food as they normally do then take a much closer look.
If you have any doubts at all then at least speak to your vet, often advice is free - even if there is a charge it's better than losing a sheep + lambs + fallen stock charge.
Thanks
Gareth
www.suppliesforsmallholders.co.uk